JPH0896868A - Ground structure of shielded wire - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to easily withstand some pulling. A notch portion 41 that penetrates the inside and the outside is formed in a housing 40 that constitutes the first cylindrical body, and a spring piece 43 that protrudes toward the inner peripheral side and the outer peripheral side is formed in the notch portion 41. The housing 40 is accommodated in the shield cap 20 that is provided and constitutes the second cylinder. The shield cap 20 is connected to the metal case 10, and when the shielded electric wire 30 exposing the braided wire 32 is penetrated into the housing 40, the spring piece 43 contacts the shielded electric wire 30 on the inner peripheral side of the housing 40 to be connected. Since the outer peripheral side is connected to the shield cap 20, the shield wire 30 is movable in the axial direction of the housing 40 while maintaining continuity between the braided wire and the metal case 10, and the breakage occurs even when a pulling force is applied. do not do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground structure for a shielded electric wire having a braided wire, and more particularly to a ground structure for electrically connecting the braided wire to a metal case.

[0002]

2. Description of the Related Art Heretofore, as a grounding structure for this type of shielded wire, the one disclosed in Japanese Patent Application Laid-Open No. 5-251116 shown in FIG. 8 has been known. The earth structure shown in the publication is a cylindrical inner ring 3 made of a conductor having an inner diameter substantially the same as the outer diameter of the inner wire 2 of the shielded electric wire 1, and a cylindrical hole having a tapered hole expanding from one end side to the other end side. The outer ring 6 has an inner diameter substantially equal to the outer diameter of the outer cover 5 of the shielded electric wire 1, and a screw 8 for fastening the outer ring 6 to the metal case 7. The inner ring 3 has a through hole 9 into which the extension 2 can be inserted and the inner ring 3 cannot be inserted.

The shielded electric wire 1 is preliminarily inserted from the small diameter side of the outer ring 6, and the tip of the inner ring 3 is inserted between the inner wire 2 and the braided wire 4 at the end of the shielded electric wire 1.
When the inner wire 2 of the shielded electric wire 1 is inserted into the through hole 9 of the metal case 7, the other end of the inner ring 3 abuts against the wall surface around the through hole 9, so that the outer ring 6 is moved to the metal case 7
Pull it to the side of and fasten with screws 8. The braided wire 4 is sandwiched between the tip of the inner ring 3 and the small-diameter end of the outer ring 6 for electrical conduction, and the other end of the inner ring 3 has a through hole 9
The braided wire 4 is brought into conduction with the metal case 7 because the braided wire 4 comes into contact with the wall surface around the piece and becomes electrically conductive.

[0004]

In the above-described conventional shield wire grounding structure, since the end portion of the shield wire 1 is completely fixed to the metal case 7, the shield wire 1 is momentarily pulled. However, there is a problem that the shielded electric wire 1 has to endure and may be broken. The present invention has been made in view of the above problems, and an object of the present invention is to provide a ground structure for a shielded electric wire that can easily withstand a slight pull or the like.

[0005]

In order to achieve the above object, the invention according to claim 1 is such that a shielded electric wire in which an insulation-coated inner wire is covered with a braided wire and an outer periphery is insulation-coated penetrates a metal case. A grounded structure of a shielded wire that is inserted into a hole and electrically connects the braided wire to the metal case for ground connection, and a conductor shield ring having a double-tube structure in which the braided wire of the shielded wire is sandwiched and crimped, A conductor-made shield ring inserted at a predetermined interval and having one end connected to the metal case, and a conductor-made first cylinder, which is held in the first cylinder, and the inner surface of the first cylinder and the conductor. And a spring piece made of a conductor arranged so as to elastically contact the outer surface of the shield ring made of a conductor.

The invention according to claim 2 is the same as claim 1.
In the ground structure of the shielded electric wire according to the item (1), the shielded electric wire includes a second cylindrical body having a notch formed in the peripheral wall, which is a cylindrical body that can be inserted into the inside and outside of the peripheral wall in the notch of the second cylindrical body. The spring piece is held so as to project. Furthermore, the invention according to claim 3 is the same as claim 2
In the ground structure of the shielded electric wire described in (1), a rubber plug is interposed between the shielded electric wire and the first cylindrical body. Further, in the invention according to claim 4, a shielded wire in which an insulation-coated inner wire is covered with a braided wire and an outer periphery is insulation-coated is inserted into a through hole of a metal case, and the braided wire is conducted to the metal case. At least a grounded structure of a shielded wire for earth connection, in which a conductor cylinder is connected to the metal case, and a metal spring piece protruding toward the inner circumference of the cylinder is formed, The braided wire is sandwiched and crimped by a conductor shield ring having a double tube structure to be inserted into the tubular body, and the spring piece is brought into contact with the conductor shield ring.

[0007]

In the invention according to claim 1 configured as described above, the braided wire of the shielded electric wire is sandwiched and crimped by the shield ring made of a conductor having a double tube structure, and one end is made of a conductor made of a conductor. When the shield wire is inserted into the first cylinder, the spring piece held in the first cylinder elastically contacts the inner surface of the first cylinder and the outer surface of the conductor shield ring. As a result, the braided wire is electrically connected to the metal case through the conductor shield ring, the spring piece, and the first cylindrical body. The braided wire of the shielded wire can be moved in the axial direction only because the spring piece is in contact with the outer circumference from the outer circumference to conduct electricity. Also,
In the invention according to claim 2 configured as described above, a notch is formed in the peripheral wall of the second cylinder, which is a cylinder into which the shielded electric wire can be inserted, and the notch is formed in the notch. Since the spring piece made of a conductor protruding inside and outside is held, when the second cylinder is inserted into the first cylinder, the spring piece protruding outward from the cutout contacts the inner peripheral wall of the first cylinder. Contact and conduct. On the other hand, when the shielded electric wire to which the conductor shield ring is attached is exposed and inserted into the second cylindrical body, the spring piece protruding inside the peripheral wall comes into contact with the conductor shield ring to conduct electricity.

Further, in the invention according to claim 3 configured as described above, since the shielded electric wire is held by the first cylindrical body through the rubber stopper, the braided wire is slightly moved in the axial direction. The rubber stopper buffers, and a large movement causes the rubber stopper and the shielded wire to slip and buffer. Further, in the invention according to claim 4 configured as described above, the shielded wire penetrates the tubular body and enters the metal case, and the spring piece is in contact with the braided wire from the outer periphery to be in conduction. The shielded electric wire can freely move in the axial direction of the tubular body.

[0009]

As described above, according to the present invention, since the shielded electric wire which penetrates the first cylindrical body connected to the metal case can be moved in the axial direction, the slide wire can be slid even if it is slightly pulled. Therefore, it is possible to provide a ground structure for a shielded electric wire, which can escape and be prevented from breaking.

According to the second aspect of the invention, since the spring piece is held in the notch of the second cylinder, a simple structure having a double cylinder structure can be obtained. Further, according to the third aspect of the present invention, by using the rubber stopper to hold the shielded electric wire, it is possible to spontaneously return the shielded electric wire to the original position.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a ground structure for a shielded electric wire according to an embodiment of the present invention. In the figure, a through hole 11 is formed in the metal case 10, and a flange portion 21 capable of covering the through hole 11 is formed in a cylindrical shield cap (first cylinder) 20. The peripheral edge of the flange portion 21 is bent toward the metal case 10 side along the entire circumference thereof, and the ring-shaped rubber packing 12 is interposed along the periphery of the through hole 11 so that the flange portion 21 is made of rubber. While pressing the packing 12, the bolt 1 is pressed until the end of the flange 21 comes into contact with the surface of the metal case.
It is fixed by screwing at 3.

The shield cap 20 is constructed by brazing and connecting a metal tubular body 22 to the flange portion 21, and has an outer diameter inside thereof.
The shield wire 3
A tubular housing (second tubular body) 40 having a diameter slightly larger than the outer diameter of 0 is inserted. The housing 40 is made of resin, and a pair of wide notches 41, 41 are formed at the opening end on the metal case 10 side toward the opposite end. In the present embodiment, two cutouts 41 are formed, but the number can be increased or decreased as necessary.
Spring pieces 43, each of which is formed by bending the front end side of the metal plate piece so as to have a rhombic cross section, are held in the respective cutout portions 41. The slits 4 are formed on both side walls of the inner peripheral surface of each notch portion 41 from the opening side of the housing 40.
2 and 42 are formed, and convex portions 43a and 43a that are wider than the width of the cutout portion 41 are formed on both side surfaces on the rear end side of the spring piece 43, respectively. When the spring piece 43 is inserted into the cutout portion 41, the convex portions 43a, 43a on the rear end side are pushed into the slits 42, 42 and fixed. The tip side of the spring piece 43 is bent in a rhombus shape, and the housing 40
Slightly projecting to the outer peripheral surface and also slightly projecting to the inner peripheral surface. In the present embodiment, the diamond shape is used, but it may be a shape that is bent in a dogleg shape and slightly protrudes from the outer peripheral surface and the inner peripheral surface. Further, in holding the spring piece 43 in the housing, not only such press-fitting but also another method can be used. Further, the housing 40 itself may be made of metal and the spring piece 43 may be integrally formed. A flange portion 44 having a slightly larger outer diameter is formed at the end portion of the housing 40 on the side where the cutout portions 41, 41 are formed.

On the other hand, in the shielded electric wire 30, a braided wire (outer conductor) 32 is covered around an inner wire 31 formed by covering a large number of core wires with an insulator, and the outer circumference is covered with a resin outer skin 33. Is configured. As shown in FIGS. 3 and 4, the tip of the shielded electric wire 30 is peeled off in stages, and the shield ring 34 is attached to the braided wire 32. The shield ring 34 is formed by folding a single cylinder back to form a double wall surface having a U-shaped cross section. As shown in FIG.
The tip of the braided wire 32 knitted in a tubular shape is inserted between the double wall surfaces, and clamped and fixed by clamping. A cylindrical rubber plug 50 is inserted into the opening of the shield cap 20 on the side opposite to the side where the flange portion 21 is formed. The rubber plug 50 has corrugations on the outer and inner circumferences, the outer diameter is slightly larger than the inner diameter of the shield cap 20, and the inner diameter is slightly smaller than the outer diameter of the shield wire 30. . Since it has a pleated shape, when it is inserted into the shield cap 20, the outer peripheral portion is slightly crushed to maintain watertightness, and when the shielded wire 30 is inserted, the inner peripheral portion is slightly crushed to maintain watertightness.

Next, the assembling of this embodiment having the above construction will be described. First, in the housing 40, the spring piece 43 is inserted into the cutout portion 41 from the flange portion 44 side. When the protrusions 43 a, 43 a protruding to the side surface of the spring piece 43 are aligned with the slits 42, and pushed in, the spring piece 43 is held in the cutout portion 41. At this time, since the tip end side exceeds the thickness of the housing 40 and is curved in a rhombus shape, it is in a state of slightly protruding on the outer peripheral side and the inner peripheral side. The housing 40 is inserted from the opening of the shield cap 20 on the side where the flange portion 21 is formed. As described above, since the spring piece 43 projects to the outer surface side of the housing 40, the spring piece 43 abuts on the inner peripheral surface of the shield cap 20 to be electrically conducted, and is also easily fixed.

On the other hand, in the shielded electric wire 30, the rubber plug 50 is preliminarily passed, the tip is peeled off in stages, and the shielded electric wire 30 is inserted. The shielded wire 30 is inserted into the U-shaped opening of the shield ring 34, and the braided wire 32 is inserted into the shield ring 34.
Introduced into the folded space. As shown in FIG. 4, when the braided wire 32 is inserted deep into the U-shaped space, the shield ring 34 is crushed from the outer peripheral side, and the braided wire 32 is crimped between the two folded wall surfaces. Next, the shielded electric wire 30 to which the shield ring 34 is attached is inserted into the opening of the shield cap 20 on the side where the flange portion 21 is not formed. The shield ring 34 is the housing 4
When it is inserted into 0, the spring piece 43 projecting to the inner peripheral surface side of the housing 40 comes into contact with the outer peripheral surface of the shield ring 34 and is electrically connected while being sandwiched from both sides. The rubber plug 50 is pushed into the shield cap 20 at a position where it is inserted until the spring piece 43 and the shield ring 34 face each other. The rubber plug 50 is crushed between the shield cap 20 and the shield electric wire 30, and the elastic force fixes the shield electric wire 30 to the shield cap 20 so as not to be displaced.

When the rubber packing 12 is interposed between the flange portion 21 of the shield cap 20 and the metal case 10 and is fixed by tightening the bolt 13, the flange portion 2
The tip of 1 is pressed against the metal case 10 so that it is electrically connected. The braided wire 32 is caulked and fixed to the shield ring 34 so as to be in conduction, and the spring piece 43 abuts on the shield ring 34 to electrically conduct them, and the spring piece 43 is attached to the inner peripheral surface of the shield cap 20. Since the shield cap 20 is in contact with and electrically connected to the metal case 10 via the flange portion 21, the braided wire 32 and the metal case 10 are electrically connected to each other. There is.

In this state, if the shielded wire 30 is pulled by vibration or other external force, the shielded wire 30
The rubber plug 50 holding the wire is bent, and the shielded electric wire 30 is displaced relative to the shield cap 20 in the axial direction. Along with this, the shield ring 34 also shifts in the axial direction, but the spring piece 43 moves from the outer peripheral side to the shield ring 34.
Since the shielded electric wire 30 is easily displaced, the elastic force of the rubber plug 50 returns to the original position when the external force disappears. When the external force is large, the shielded wire 30 slides with respect to the rubber plug 50 and moves in the removal direction, but it can be easily returned to its original position by pushing it in again.

As shown in FIG. 1, a terminal may be connected to the tip of the extension 31. As described above, the housing 40 forming the second tubular body is formed with the notch portion 41 penetrating the inside and outside thereof, and the spring piece 43 projecting toward the inner peripheral side and the outer peripheral side is formed in the notch portion 41.
And the housing 40 is housed in the shield cap 20 that constitutes the first cylinder. The shield cap 20 is connected to the metal case 10, and when the shielded wire 30 exposing the braided wire 32 forming the shielded wire is passed through the inside of the housing 40, the spring piece 43 is provided on the inner peripheral side of the housing 40. Since the shield wire 20 is connected to the shield cap 20 on the outer peripheral side, the shield wire 30 is movable in the axial direction of the housing 40 and a pulling force is applied to the shield wire 20 while maintaining continuity between the braided wire and the metal case 10. Does not break even when played.

5 to 7 show another embodiment of the present invention. The shield cap (first cylinder) 120 is configured by connecting two cylindrical bodies 122 to one dish-shaped flange portion 121, and each has a housing (second cylinder) 14
0 is inserted. Further, as shown in FIG. 6, the rubber stoppers 150, 150 are inserted into both sides of the housing 140, and the rubber stoppers 15 are provided outside the rubber stoppers 150, 150.
A disk-shaped retainer 151 is attached to prevent 0 from coming off. The outer diameter of the retainer 151 is generally the tubular body 122.
Of the protrusion 151a is formed on a part of the inner peripheral diameter of
A recess 122a corresponding to a is formed. In addition, in the rubber plug 150, the inner diameter of the rubber plug 150 on the inner peripheral side of the metal case is slightly reduced, so that the braided wire 132
The extension 131 is in close contact with the inner periphery of the rubber stopper 150 in the exposed state.

In this embodiment, the diamond-shaped spring piece 43 is used.
In place of, a dogleg-shaped spring piece 143 is used, which is press-fitted and held in the housing 140 at one end in the notch 141, and protrudes toward the inner peripheral side of the housing 140 at an intermediate bent portion and at the other end. So as to project to the outer peripheral side of the housing 140. Spring piece 14 in housing 140
When 3 and 143 are press-fitted and inserted into the inner circumference of the shield cap 120, the ends of the spring pieces 143 come into contact with the inner circumference surface of the shield cap 120 and are connected. Next, rubber stopper 1
50 is pushed in from both sides, the retainer 151 is inserted from the outside, and the lid is closed. Inserting the shielded electric wire 130 with the shield ring 134 attached, the shield ring 1
When 34 enters between the two rubber plugs 150, 150, the intermediate portion of the spring piece 143 abuts on the outer peripheral surface of the shield ring 134 and is connected. As a result, the braided wire 132 is connected to the metal case via the shield ring 134, the spring piece 143, and the tubular body 122.

In this embodiment, since the rubber stoppers 150, 150 are mounted on both sides of the housing 140, it is possible to cope with both pushing and pulling of the shielded wire.

[Brief description of drawings]

FIG. 1 is a sectional view of a ground structure for a shielded electric wire according to an embodiment of the present invention.

FIG. 2 is a perspective view of a housing.

FIG. 3 is a perspective view of a shielded electric wire.

FIG. 4 is a cross-sectional view of a shielded electric wire.

FIG. 5 is an exploded perspective view of a ground structure for a shielded electric wire according to another embodiment.

FIG. 6 is a cross-sectional view of a ground structure for a shielded electric wire according to another embodiment.

FIG. 7 is a perspective view of a ground structure for a shielded electric wire according to another embodiment.

FIG. 8 is a cross-sectional view of a conventional ground structure for a shielded wire.

[Explanation of symbols]

 10 ... Metal case 20 ... Shield cap 22 ... Cylindrical body 30 ... Shield electric wire 31 ... Internal wire 32 ... Braided wire 33 ... Outer sheath 34 ... Shield ring 40 ... Housing 41 ... Notch part 43 ... Spring piece 50 ... Rubber plug 120 ... Shield Cap 122 ... Cylindrical body 130 ... Shielded electric wire 131 ... Internal wire 132 ... Braided wire 134 ... Shield ring 140 ... Housing 143 ... Spring piece 150 ... Rubber plug

Front Page Continuation (72) Inventor Toshiyuki Sekimori 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd. (72) Inventor Yassho Fukao 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd.

Claims (4)

[Claims] 1. A shielded wire in which an insulation-coated inner wire is covered with a braided wire and whose outer periphery is insulation-coated is inserted into a through hole of a metal case, and the braided wire is electrically connected to the metal case to be grounded. The ground structure of the shielded wire, wherein the conductor shield ring of the double tube structure in which the braided wire of the shielded wire is sandwiched and crimped, and the conductor shield ring are inserted at a predetermined interval and one end of the shielded wire is attached to the metal case. A first cylindrical body made of a conductor to be connected, and a spring piece made of a conductor held in the first cylindrical body and arranged so as to elastically contact the inner surface of the first cylindrical body and the outer surface of the shield ring made of a conductor. A shielded wire grounding structure comprising: 2. The ground structure for a shielded electric wire according to claim 1, wherein the shielded electric wire is insertable into the first cylindrical body, and a cutout is formed in a peripheral wall of the cylindrical body. A ground structure for a shielded electric wire, comprising two tubular bodies, wherein the spring piece is held so as to project inside and outside the peripheral wall in the notch of the second tubular body. 3. The ground structure for the shielded electric wire according to claim 2, wherein a rubber plug is interposed between the shielded electric wire and the first cylindrical body. 4. A shielded wire, in which an insulation-coated inner wire is covered with a braided wire and whose outer periphery is insulation-coated, is inserted into a through hole of a metal case, and the braided wire is electrically connected to the metal case to be grounded. A ground structure for a shielded wire, in which a conductor cylinder is connected to the metal case, and a metal spring piece protruding toward the inner circumference of the cylinder is formed, and the braided wire of the shield wire is doubled. A ground structure for a shielded wire, which is characterized in that it is sandwiched and crimped by a conductor-made shield ring having a tubular structure, inserted into the tubular body, and the spring piece is brought into contact with the conductor-made shield ring.